What sandwich?

My five year old has packed lunches at school. He's happy with a ham sandwich but I do worry about filling him up daily with processed meats. What do you guys put in your DC's lunch box? I also put in yoghurt, grapes, satsumas and occasionally crisps and a Penguin or such like not the animal, obvs. Would love some sarnie ideas for a boy who only wants cheese, ham and chorizo x